Abstract:

Porous hydroxyapatite（HA）ceramic coating on pure titanium (TA2) substrate was fabricated by microarc oxidation (MAO) in electrolytic solution containing calcium acetate monohydrate and sodium biphosphate dihydrate salt. The morphology, phase and composition of the coating were characterized by scanning electron microscopy (SEM), Xray diffraction (XRD), energy dispersive Xray spectrometry (EDS) and Fourier transmission infrared spectrometry (FT-IR). The bioactivity of the HA ceramic coating was investigated by simulated body fluid (SBF) tests in vitro. The result shows that the ceramic coating was formed on pure titanium substrate, and hydroxyapatite phase was found in the ceramic coating after the microarc oxidation for 10 min. Moreover, HA ceramic coating was proved to be of excellent bioactivity from the carbonatecontaining HA formation on the ceramic coating surfaces. The coatings of MAO are covered completely by the carbonatecontaining HA ceramic coatings after 48 h exposure to simulated body fluid.

Key words: pure titanium, microarc oxidation, ceramic membrane, hydroxyapatite, bioactivity